Question

${P{O}_4}^{3-}$ is a pentavalent anion.

• A. True
• B. False

Answer 1

The correct option is B False

The valency of an ion is equal to the charge on the ion.
In $P{O}_4^{3-}$ valency of $P$ is $+5$ and each of 4 $O$, has $-2$ valency. Therefore valency/charge on phosphate is: $5+4\times (-2)=-3$
Therefore, $P{O}_4^{3-}$ is trivalent and not pentavalent.
Hence, the statement is false.

Hence, $B$ is the correct option.